300 AAC BLACKOUT UPPER ASSEMBLYSPECIFICATIONS:300 AAC Blackout
Barreled upper receivers can be used on existing MSR-type lower receivers
Bushmaster 4150 chrome moly-vanadium steel barrels feature hard-chrome lining in both bore and chamber for extended barrel life..
The Patrolman is the classic M4-style upper assembly, featuring a mil-spec, forged removable carry handle for shooting with iron sights or optics. It will drop-in to virtually any standard AR-15 lower receiver. Complete with a standard A2-style dual aperture rear sight in a removable carry handle wi..